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VP-2040 Enhanced IED
V-PM2000 Series, Veesta Power Measurement
Instructions & User's Manual
Chapter 8 -
8.1
PLC Modbus® Compatible
8.2
Comprehensive System Integration
8.3
Transmission Mode
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Protocol and Communication
The Modbus® communications protocol allows information and data
to be efficiently transferred between the Enhanced-IED VP-2040
series and Modicon programmable logic controller (PLC) or other
third party Modbus® compatible monitoring and control system. The
VP-2040 also can establish a monitoring system simply to adopt an
IPC-based centralized master running software.
The Enhanced-IED VP-2040 provides the Modbus® compatible as a
standard feature for comprehensive system integration. The PLC
compatible
RS485
information and data to be transferred efficiently between the IED
VP-2040 and PLC, existing RTU Power SCADA system, DCS
system, IPC running software.
The mode of transmission is the structure of the individual units of
information within a message, and the numbering system used to
transmit the data. The mode is defined in the following which is
compatible with Modbus® protocol - RTU Mode.
Table 8-1: VP-2040 Modbus conventions table
Item
Coding System
Start bits
Data bits
Parity
Stop bit
Error Checking
Start of Frame
Chapter 8 - Protocol and Communication
Modbus®
communication
Convention
8-bits binary
1
8
No parity
1
CRC (Cyclical Redundancy Check)
silence on line for time ≥ 4 characters
protocol
allows
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